docs: def _closing_bracket_index(self, text, bpair=('(', ')')):
          """Return the index of the closing bracket that matches the opening bracket at the start of the text."""
          level = 1
          for i, char in enumerate(text[1:]):
              if char == bpair[0]:
                  level += 1
              elif char == bpair[1]:
                  level -= 1
              if level == 0:
                  return i + 1